Sapphire has backed high-profile startups such as Square, Box, and Fitbit and plans to use the new fund to invest in growth-stage technology startups, the firm said on Wednesday.

The $1 billion pot is Sapphire Ventures' third and largest fund and nearly doubles the assets the firm has under management to $2.4 billion.

"It's been a good five years," said Nino Marakovic, chief executive and managing director of Sapphire Ventures.

Venture capitalists raised $8.8 billion in the second quarter, down from a whopping $14 billion in the first quarter but still keeping this year on track to be the biggest for VC fundraising since 2001.

Sapphire Ventures invests in the United States, Europe, Israel and emerging markets including Brazil. It has seen 38 exits in its portfolio, including 15 initial public offerings.

But the firm has felt the lackluster performance of the IPO market this year, which is off 55 percent from 2015, according to Renaissance Capital, a manager of IPO-focused funds. Two of the firm's investments, data and storage company Nutanix and electronic signature service DocuSign, have long delayed IPO plans.

Although it focuses on expansion-stage startups, the firm has started investing earlier in companies to avoid the high valuations that have ballooned at the later stage, Marakovic said.

"As the valuations have gotten steamier and heavier in the pre-IPO rounds," he said, the firm has joined earlier funding rounds.